著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL United States. Bureau of the Census,"United States summary : total population for states and counties, for urban and rural areas, and for incorporated places of 1,000 and over",,United States Government Printing Office,1931,"Fifteenth census of the United States, 1930",,,,https://cir.nii.ac.jp/crid/1130282272129454080